import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6]])

print("数组维度：", arr.ndim)   # 输出: 2
print("数组形状：", arr.shape)  # 输出: (2, 3) -> 2行3列
print("数组元素总数：", arr.size) # 输出: 6
print("数组数据类型：", arr.dtype) # 输出: int64 (取决于系统)